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View search results from all Wolfram sites (467155 matches)The study of numbers for the supposed purpose of predicting future events or seeking connections with the occult.
Except for convex polygons, every simple polygon has at least one mouth.
A broad area of mathematics connected with functional analysis, differential equations, index theory, representation theory, and mathematical physics.
A tree is planted at each lattice point in a circular orchard which has center at the origin and radius r. If the radius of trees exceeds 1/r units, one is unable to see out ...
A point which lies on at least one ordinary line is called an ordinary point, or sometimes a regular point.
A surface which is homeomorphic to a finite collection of spheres, each with a finite number of handles, cross-handles, cross-caps, and perforations. A preliminary version of ...
Given four points, A, B, C, and H, let H be the orthocenter of DeltaABC. Then A is the orthocenter DeltaHBC, B is the orthocenter of DeltaHAC, and C is the orthocenter of ...
A palindromic number is a number (in some base b) that is the same when written forwards or backwards, i.e., of the form a_1a_2...a_2a_1. The first few palindromic numbers ...
The Pappus configuration is the 9_3 configuration illustrated above that appears in Pappus's hexagon theorem. It is one of the three 9_3 configurations. The Levi graph of the ...
AW, AB, and AY in the above figure are in a harmonic range.
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